and let your wrath not be kindled: From here you learn that he spoke to him harshly.

ואל יחר אפך: מכאן אתה למד שדבר אליו קשות:

for you are like Pharaoh: This is its simple meaning. Its midrashic meaning is, however: You will ultimately be punished with צָרַעַת because of him, just as Pharaoh was punished because of my great-grandmother Sarah for the one night that he detained her (Gen. 12:17). Another explanation: Just as Pharaoh issues decrees and does not carry them out, makes promises and does not fulfill them, so do you. Now, is this the “setting of an eye,” concerning which you said [that you wanted] “to set your eye upon him” ? [See verse 21.] Another explanation: For like you, so is Pharaoh-if you provoke me, I will kill you and your master. [From Gen. Rabbah 93:6]

19My lord asked his servants, saying, 'Have you a father or a brother?'

יטאֲדֹנִי שָׁאַל אֶת עֲבָדָיו לֵאמֹר הֲיֵשׁ לָכֶם אָב אוֹ אָח:

My lord asked his servants: From the beginning, you came upon us with a pretext. Why did you have to ask all these [questions]? Were we looking to [marry] your daughter, or were you looking to [marry] our sister? Nonetheless, “we said to my lord” (verse 20). We did not conceal anything. [From Gen. Rabbah 93:8]

and misfortune befalls him: For Satan accuses at the time of danger. [From Gen. Rabbah 91:9]

וקרהו אסון: שהשטן מקטרג בשעת הסכנה:

you will bring down my hoary head in misery, etc.: Now that he is with me, I comfort myself over [the loss of] his mother and over [the loss of] his brother, but if this one [too] dies, it will seem to me as if the three of them died in one day. [From Gen. Rabbah ff. 93:8]